Changes between Version 139 and Version 140 of doc/app/initialization_parameters

Timestamp:

Dec 23, 2010 12:51:35 PM (14 years ago)

Author:

suehring

Comment:

--

doc/app/initialization_parameters

@@ -752 +752 @@
 }}}
 {{{#!td style="vertical-align:top"
-'pw-scheme'
+'ws-scheme'
 }}}
 {{{#!td
 Advection scheme to be used for the momentum equations.\\\\
 The user can choose between the following schemes:\\\\
+'' 'ws-scheme' ''\\\\
+      The 5   th order upwind scheme of Wicker and Skamarock (2002, Mon. Wea. Rev, 130, 2088-2097) is used. The dispersion error is     much smaller than the dispersion error of 'pw-scheme'. The 5  th order schemes implies a small numrical dissipation that stabilized the solution. To assure a stable numerical solution the time integration has to be carry out with [#timestep_scheme timestep_scheme] = 'runge-kutta-3' . This scheme is based on a formultion of the advection term in flux form, which requires a vanishing divergence of the flow field, else a stable numerical solution is not given. So [#call_psolver_at_all_substeps call_psolver_at_all_substeps] = 'True' has to be used. When [#psolver psolver] = 'multigrid' the [#residual_limit residual_limit] should be smaller than 1.0E-9 for a sufficient reduction of the divergences. For the moment the scheme can only be used in conjunction with [#topography topography] = 'flat'. So far [#bc_lr bc_lr] /= 'cyclic' or [#bc_ns bc_ns] /= 'cyclic' are not allowed with [#loop_optimization loop_optimization] = 'vector' in combination with 'ws-scheme'.
+
+Note: Due to the larger stencil of this scheme vertical grid stretching should be handled with care.\\\\
 '' 'pw-scheme' ''\\\\
       The scheme of Piascek and Williams (1970, J. Comp. Phys., 6, 392-405) with central differences in the form C3 is used.
@@ -941 +945 @@
 }}}
 {{{#!td style="vertical-align:top"
-'pw-scheme'
+'ws-scheme'
 }}}
 {{{#!td
 Advection scheme to be used for the scalar quantities.\\\\
 The user can choose between the following schemes:\\\\
+'' 'ws-scheme' ''\\\\
+      The 5   th order upwind scheme of Wicker and Skamarock (2002, Mon. Wea. Rev, 130, 2088-2097) is used. The dispersion error is     much smaller than the dispersion error of 'pw-scheme'. The 5  th order schemes implies a small numrical dissipation that stabilized the solution. To assure a stable numerical solution the time integration has to be carry out with [#timestep_scheme timestep_scheme] = 'runge-kutta-3' . This scheme is based on a formultion of the advection term in flux form, which requires a vanishing divergence of the flow field, else a stable numerical solution is not given. So [#call_psolver_at_all_substeps call_psolver_at_all_substeps] = 'True' has to be used. When [#psolver psolver] = 'multigrid' the [#residual_limit residual_limit] should be smaller than 1.0E-9 for a sufficient reduction of the divergences. For the moment the scheme can only be used in conjunction with [#topography topography] = 'flat'. So far [#bc_lr bc_lr] /= 'cyclic' or [#bc_ns bc_ns] /= 'cyclic' are not allowed with [#loop_optimization loop_optimization] = 'vector' in combination with 'ws-scheme'.
+
+Note: Due to the larger stencil of this scheme vertical grid stretching should be handled with care.\\\\
 '' 'pw-scheme' ''\\\\
       The scheme of Piascek and Williams (1970, J. Comp. Phys., 6, 392-405) with central differences in the form C3 is used.